Server Core is not supported as an install platform for the coordinator:
https://support.quest.com/technical-documents/change-auditor/7.0/release-notes/2#TOPIC-895509
Server Core is a supported as an install platform for the agents:
https://support.quest.com/technical-documents/change-auditor/7.0/release-notes/3#TOPIC-895512
Here are the command line switches you can use for installing the MSI, but there's no way to apply a license:
https://support.quest.com/technical-documents/change-auditor/7.0/installation-guide/18